the longer breaks in the beam. This should cause no problems as even the current laser power supply has the provision for remote triggering.
Figure 1.55:Scheme of T0 DCS.
The DCS scheme for the T0 detector is shown in Fig. 1.55. The main sub-systems are high voltage (HV), low voltage (LV), settings threshold and delays, laser control, generator control and T0–TDCs and T0–DRM readout cards. The list of signals to be monitored and controlled for the T0 detector is listed in Table 1.8.
The T0 electronics will be located in two different areas: the shoebox will be placed inside the magnet (these regions can be accessed only during a long shutdown), fast electronics and T0 TDC/DRM cards will be in the crates just outside the L3 and can be accessed even during a short shutdown. The High and Low Voltage to the PMTs and electronics will be provided by a CAEN SY2527 system with high and low voltage boards. A CAEN OPC server will interface the crate with PVSS, through Ethernet.
The connections between the control computer and the VME crates with fast electronics will be based on a CAEN V2718-A2818 VME-PCI optical link bridge. The module V2718 is a 1-unit wide 6U VME master module, which can be interfaced to the CONET (Chainable Optical NETwork) and controlled by a standard PC equipped with the PCI card CAEN module A2818. The T0–TRM and T0–DRM are presently under development by the ALICE TOF group and we shall use their solution.
For fast electronics we shall use standard VME crates. The control and monitoring will be via CANbus and Kvaser CAN interface card. The top-level application will be a SCADA system based on PVSS software that communicates with the hardware via OPC or DIM servers. Support for all equipment will be implemented based on the JCOP framework.
1.12 Organization
1.12.1 Participating Institutes
The main institutes participating in the design, construction and operation of the T0 detector are:
• HIP — University of Jyv¨askyl¨a, Department of Physics and Helsinki Institute of Physics, Jyv¨askyl¨a, Finland;
Table 1.8:Main parameters of the Detector Control System for the T0.
Subsystem location Controlled parameters Number Parameter Control Fast
electr.
VME delays
Thresholds and walks for CFD Thresholds for T0-v
Thresholds for multiplicity trigger
24 24 2 -3
-voltage voltage -voltage
-W R/W -R/W
T0-TRM VME
crate
same as TOF
T0-DRM VME
crate
same as TOF Low
volt-age for Shoebox
CAEN 1527
LV supply on/off LV settings and readings safety switch
24 24 1
voltage complex voltage
R/W R/W on/off HV
volt-age
- HV supply on/off
HV settings and readings safety switch
24 24 1
voltage complex voltage
R/W R/W on/off Laser
system
- switch
attenuator
1 1
-complex
on/off R/W
Generator - switch 1 voltage on/off
– Wladyslaw Trzaska (Project Leader) – Sergey Iamaletdinov (Graduate Student) – Vladimir Lyapin (Shoebox, LCS)
– Tomasz Malkiewicz (Graduate Student, Database)
• MEPhI - Moscow Engineering Physics Institute, Moscow, Russia – Vladislav Grigoriev (Leader of the Russian Team)
– Vladimir Kaplin (Electronics)
– Alexandr Karakash (PMT, test measurements) – Vitaly Loginov (Electronics)
• INR — Academy of Science, Institute of Nuclear Research, Moscow, Russia – Alexei Kurepin (INR Group Leader)
– Fedor Guber (Mechanics)
– Tatyana Karavicheva (DCS, readout) – Oleg Karavichev (Electronics) – Victor Marin (CFD)
– Alla Mayevskaya (Simulations) – Andrei Reshetin (PMT shielding)
• KI — Russian Research Center “Kurchatov Institute”, Moscow, Russia – Evgeni Meleshko (T0 Vertex, Multiplicity)
– Anatoly Klimov (Technical Project)
1.12 Organization 49
• WAU — Warsaw University of Technology, Faculty of Physics, Warsaw, Poland – Radomir Kupczak (DCS, readout)
– Wiktor Peryt
The Greek group from Athens (Marta Spyropoulu-Stasinakhi) has also expressed serious interest in participating in the T0 DAQ. The Greek group would contribute both in terms of manpower and core costs.
1.12.2 Cost Estimate and Resources
During the signing of the Memorandum of Understanding the T0 project as such did not yet exist. It evolved later by dividing the initial FMD into T0, V0 and the current FMD (based on silicon detectors).
It is therefore still unclear how much core money can be used by T0. The only currently available cash comes from part of the Finnish Core Contribution. At the start of the project it was 200 kCHF. This was estimated roughly sufficient for the detector modules, mechanics and front-end electronics. By the end of 2004 more than half of that sum will have been spent. To complete the entire project additional funds will be needed. The main uncertainty is the cost of readout modules. They are custom made by the TOF collaboration and do not have a clear price tag. The final price of the High and Low Voltage power supply systems is also unclear. Systems like the new (not yet on the market) C.A.E.N. EASY are expensive but the cost per channel can be substantially reduced if shared with another subdetector. We are exploring such possibilities. All in all the total cost of T0 should be of the order of 400 kCHF.
1.12.3 Commissioning
T0 is a small detector giving some degree of flexibility in defining and meeting internal milestones. There are, however, issues where no delays are permitted. In August 2006 installation of the detectors on RB26 will start and T0-C will be the first detector installed. This is the most important milestone because after the installation T0-C shall remain practically inaccessible until the end of the operation of ALICE (see the chapter on integration). Therefore it is of utmost importance to ensure the quality and reliability of all parts of T0-C. All the other components of T0, even those inside the L3 magnet (T0-A and the shoeboxes) will have reasonable accessibility, allowing for modification and replacement even during short shutdown periods. In light of this perfection of the detector modules is in the highest priority for us until August 2006. By the end of 2005 T0-C and T0-A will be pre-assembled and tested in Finland prior to their shipment to CERN. Once at CERN both T0 arrays will be tested again. The test will be repeated once more after installation.
Naturally, work on electronics, readout and DCS proceeds in parallel. For instance, completion of the shoeboxes is also of high priority as it involves collaboration between several groups (T0, V0, TRD).
Right now (August 2004) the prototypes of all major electronics component have been built, fully tested and proven to work well. In principle, we should be ready to change from the prototypes to the production modules. This, however, is unlikely to happen before the end of 2005 as we are also investigating the possibility of finding some common electronics solutions with V0 and further integration with TOF. For instance we are waiting to test the latest version of the NINO chip (developed by TOF). In the event of positive results the use of a joint TOF, V0 and T0 standard would greatly simplify and accelerate our work.
The first batch of the production components for the laser system have already been ordered. One more series of test is foreseen before the full system will be purchased. If no problems arise, the laser calibration system should be complete in time for the pre-shipment tests of T0 at the end of 2005.
1.12.4 Safety Aspects
With the exception of the high voltage (1–2 kV) delivered to each of the 24 PM tubes using standard HV cables and SHV connectors, the T0 detector poses no safety hazards.
51
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